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on July 31, 2010 at 6:00 AM. Associated PressPowdery mildew is a common fungus disease on many types of plants, including peonies like the ones above. Dear Carol: For the past two years, my peonies have gotten white spots on the leaves. This happens after they have finished blooming.
It is a fungus that commonly attacks host trees such as butternut, hickory, pecan and walnut trees. Itâs found anywhere in the world where these nuts are grown. Those white spots on the plant leaves are fungal structures and spores that thrive in the warming temperatures and rains of spring. As the downy spot progresses, the upper sides of the leaves become chorotic, that is, show yellowish spots that will eventually turn brown.